Fatal error: Uncaught Error: Interface "Guzzle\Http\Message\Header\HeaderInterface" not found in /home/systemdecorcom/public_html/sg/util/nfephp/vendor/guzzlehttp/guzzle/src/Guzzle/Http/Message/Header.php:11 Stack trace: #0 {main} thrown in /home/systemdecorcom/public_html/sg/util/nfephp/vendor/guzzlehttp/guzzle/src/Guzzle/Http/Message/Header.php on line 11